The format of the tech reports ID number is TR-CS-YYYY-NN, where YYYY is the four digit year and NN is the number, including leading zeroes. For the first tech report of 2004, the search would be "TR-CS-2004-01".
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TR-CS-2004-18
Enhancing Privacy through Negative Representations of Data
Fernando Esponda, Stephanie Forrest and Paul Helman
The paper introduces the concept of a negative database, in which a set of records DB is represented by its complement set. That is, all the records not in DB are represented, and DB itself is not explicitly stored. After introducing the concept, several results are given regarding the feasibility of such a scheme and its potential for enhancing privacy. It is shown that a database consisting of n, l-bit records can be represented negatively using only O(ln) records. It is also shown that membership queries for DB can be processed against the negative representation in time no worse than linear in its size and that reconstructing the database DB represented by a negative database NDB given as input is an NP-hard problem when time complexity is measured as a function of the size of NDB.
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